Copolymerization
Subject classification: this is a chemistry resource. 
AimsEdit
 Statistical free radical copolymerization
 Copolymer composition
IntroductionEdit
 Polymerization of two or more monomers
 Properties of the polymer depend on monomer composition and time
Statistical copolymerizationEdit
RM1• + M1 → RM1M1  rate=k_{11}[RM1•][M1] 
RM1• + M2 → RM1M2  rate=k_{12}[RM1•][M2] 
RM2• + M1 → RM2M1  rate=k_{21}[RM2•][M1] 
RM2• + M2 → RM2M2  rate=k_{22}[RM2•][M2] 
 Monomers are consumed at different rates
 Therefore the polymer composition changes during the reaction
Instantaneous copolymer equation

Reactivity ratios
and
r_{A} < 1 → CROSS propagation preferred 